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Method for improving position accuracy of mold core of integrated type ceramic mold

An integral, core technology, applied in the directions of ceramic forming cores, ceramic forming mandrels, ceramic forming machines, etc., can solve problems such as increasing the complexity of the process, reduce the possibility of fracture, the method design is reasonable, and the The effect of the possibility of deformation

Inactive Publication Date: 2015-04-22
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this will inevitably increase the complexity of the process, and also change the internal structure of the original mold

Method used

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  • Method for improving position accuracy of mold core of integrated type ceramic mold
  • Method for improving position accuracy of mold core of integrated type ceramic mold
  • Method for improving position accuracy of mold core of integrated type ceramic mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]For a core that runs through up and down, the method for improving the position accuracy of the integral ceramic casting core includes the following steps:

[0045] 1) Manufacture of resin mold

[0046] The present invention utilizes light-curing rapid prototyping technology to manufacture resin molds, first utilizes commercial three-dimensional software to design resin mold CAD models, and manufactures positioning holes, see figure 1 and figure 2 , wherein, 1 is the blade body; 2 is the tenon root positioning hole; 3 is the longitudinal positioning hole; 4 is the core that penetrates up and down; 5 is the shell; STL files are imported into the rapid prototyping system to generate a two-dimensional slice file with a layered thickness of 0.1mm. Under the control of the slice file, the light-cured prototype of the resin mold is quickly and automatically manufactured. After the SL resin mold is manufactured, it is cleaned with alcohol. Excess liquid resin on the surface,...

Embodiment 2

[0060] The difference from Example 1 is that, see figure 2 , for the core that runs through up and down, weave ceramic rods in the cavity and weave ceramic rods at the bottom of the tenon. When the two ends of the ceramic rod are fixed, the bottom ceramic rod is fixed on the bottom of the resin prototype with hot melt adhesive, and the top end uses the blade structure to pre-tighten the ceramic rod on the fixed structure and then fix it. If the core twist is low, the ceramic rod can be inserted directly through it. If the twist of the core is high, insert a ceramic rod from the top and bottom of the core respectively, and the total length of the ceramic rods penetrating into the cavity should be longer than the distance between the upper and lower holes of the resin mold prototype blade. After gel injection molding, the ceramic rod is buried inside the core. The insertion of the ceramic rod can reduce the broken core rate, improve the position accuracy of the core casting pr...

Embodiment 3

[0062] The difference from Example 1 is that when weaving ceramic fibers, for the core 9 that does not penetrate up and down, such as Figure 5 As shown, the ceramic fiber is penetrated transversely in the positioning hole, such as image 3 , 4 As shown, 7 is the gate; 8 is the horizontal positioning hole; 9 is the horizontal interpenetrating fiber; after the gel injection molding, the ceramic fiber connects the core and the mold shell, the bottom of the core is constrained, the rigidity is enhanced, and the resistance Creep ability is improved. After the mold is prepared, the ceramic fibers are removed to avoid leaving holes on the surface of the blade after pouring the metal. All the other processing steps are the same as in Example 1.

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Abstract

The invention discloses a method for improving the position accuracy of a mold core of an integrated type ceramic mold, and belongs to the field of rapid costing based on stereo-lithography technologies. The method comprises the steps that (1) three-dimensional software is utilized to design a resin mold, and a resin mold prototype with a positioning hole is manufactured by utilizing a stereo-lithography method; (2) a ceramic fiber or a ceramic bar penetrates into the positioning hole according needs; (3) ceramic slurry is poured into the resin mold prototype of turbine blades through a gel casting method to obtain a mold blank; (4) vacuum freeze drying and sintering are carried out on the mold blank to obtain the integrated type ceramic mold of the turbine blades. The position accuracy of the mold core of the integrated type ceramic mold can be effectively improved through the vertically through or non-through mold core, and the method is reasonable in design, is easy and convenient to operate, greatly improves the manufacturing integrity and accuracy of the mold and is suitable for practical production.

Description

technical field [0001] The invention belongs to the field of rapid casting based on light-curing molding technology, and relates to a method for improving the position accuracy of an integral ceramic mold core. Background technique [0002] With the continuous development of rapid prototyping technology, stereolithography has been able to accurately form parts with any complex structure, and has been widely used in rapid casting, rapid tooling and other industries. In the rapid casting process based on light curing molding technology, through the gel injection molding technology, the ceramic slurry is poured in a vacuum environment to obtain the cast green body, and the green body is vacuum freeze-dried and sintered to obtain the final integral hollow turbine blade ceramics mold. [0003] The traditional method improves the deformation resistance of the core by making a core support structure inside the core. But this will inevitably increase the complexity of the process,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B7/28B28B1/14B28B1/52
CPCB28B1/14B28B1/52B28B7/28
Inventor 鲁中良陈义苗恺李涤尘张航
Owner XI AN JIAOTONG UNIV
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